I think its kind of normal, you win some you lose some, in all aspects of life. I lost one too about 5 years ago, took me about 11 months to really move on, pretty damn long time. I just wasn't ready and my immaturity hurt a good thing, stupid me in this case, not quite the same as yours but same outcome.
Anyhow, even though sometimes some things dont seem the same, I've been with the same person now for 3.5 years, and she is just about every kind of perfect I could hope for. Of course she is still a woman so she isn't 100% perfect but things are great.
All you can really do is look back once in awhile hopefully with a smile, remember the good times, but hey it just didn't work out, and there must be a reason for that. I prefer to just leave it at that because if you try to figure it out you will just go nuts, and still not figure it out, and you have a new life now to work on - not the past. Whats done is done, leave it that way.
Your still young (as am I), I'm going on 27 and the woman is going on 29.